Plaster-board and method of making same.



PATENT OFFICE.

ERNST BUSHMAN, OF NEW YORK, N. Y.

PLASTEB-BOARD AND METHOD OF MAKING SAME.

No Drawing.

To all whom it may concern:

Be it known that I, EnNs'r BUSHMAN, a citizen of the United States, residing at New York, in the county of Richmond and State of New York, have invented a certain new and useful Plaster-Board and Method of Making Same, of which the following is a specification.

This invention relates to improvements in plaster boards and to a process of producing the same and it has for its ob'ect to provide a plaster board which is reproof, moisturerproof and $0M Another object of the invention is to provide a plaster board of the above nature which is neither brittle nor crumbly and which may be sawed and nailed into with as much ease and to the same advantage as wood.

With the above and other objects in view, I have invented the plaster board which is compounded as follows :First, I take ten pounds of and add thereto twenty pounds of da and fourteen of 1ca c1c an U o onehal h To five un s u 'e mixture add one pound of a mixture composed of ten parts of d one part of Portland 0 me t and t ree parts sawdust sgredqed cornstalks: or o ier s1m1 ar vegea e er. er e mass has been thor- 01 hl mixed it is then molded and allowed tg fset and dry, when it 15 ready for use.

Boards or'forms made as above may be sawed and nailed as common wood and it makes an exceedingly cheap as well as durable building material.

lbL L iL LfiimctsJfiLb-ihuodium sim egm mwi nitra e and h drated sili a The latter and the remamlng un ecomposed silicate coat the particles of the mixture and act to pro- Specification of Letters Patent.

Application filed Kay 23, 1910. Serial No. 582,824.

Patented Mar. 11, 1913.

duce a tough and fireproof plaster board, which shall have the desired properties. The sodium nitrate may be converted eventually into inert calcium nitrate.

My product is lighter and stronger than any plaster board now on the market, and is very tough and resilient, and has the property, in addition, of being an almost perfect non-conductor of heat. It is very light and porous et has the property of being substantial y waterproof.

I claim and desire to secure by Letters Patent 1. A plaster board composed of 16. parts of a mixture of 1 pound sand, 1% pounds Portland cement and 6 ounds woody fiber, made into a plastic with 5 parts of the reaction product of 10 pounds water, 20 pounds silicate of soda and 14 ounces of nitric acid; said product being in the form of sheets having a porous appearance, and being tough, resilient, strong, non-brittle, substantially waterproof, and capable of be ing nailed without breaking, substantially as described.

2. A process of making plaster board which com rises treating sodium silicate solution with a relatively sma amount of itric acid alone' mixing 5 parts of the liquid thereby produced with about 16 parts of a mixture composed substantially of 1 pound of sand, 11} pounds of Portland cement, and 6 OUIISIHLYZQO er; ress- 'iiig the pla's 1c mass thereby pr uce int-o sheets and thereafter drying said sheets.

In testimony whereof, I have hereunto aflixed my signature in the presence of two subscribing witnesses.

ERNST BUSHMAN.

Witnesses:

RICHARD CONDON,

H. WILLIAMSON.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

